Internal-combustion engine.



P. PRINGLE.

:NTERNAL coMUsTmN ENsiNE.

APPLlCATlON FILED MAY 27. 1914.

@pieu @@ggh Patented May 25, 191.5

3 SHEETS-SHEET 2,

P. PRINGLE.

INTERNAL COMBUSTION ENGINEl APPLICATION FILED MAY21.1914.

Patented May 25, 1915..

3 SHEETS-SHEET 3.

l i sl 'r s ANT orricn.

PHILIP PRINGLE, F LIPTON, CANADA.

INTERNAL-COMBUSTION ENGINE.

insonne.

Specification of Letters Patent.

Application tiledv May 27, 1914. Serial N o. 841,345.

To all lwhom it may concern Be it known that I, PiiiLir PRinoLn, of.

the town of Lipton, in the Provinceof Saskatchewan, Canada, have invented certain new and useful inprovements in internal- Combustion Engines, of which the follcvrf ing is the specification. '1

The invention relates to iinprovinents in internal combustion engines and the object l0 `of the invention is to provide a two cycle combustion engine `leaving very eicient scavenging of thevspent gases and one in which a variabie control of the exhaust ports is supplied vwhereby the saidexliaust ports can be closed at an earlier or later time during the stroke' and complete cut off can be effected yin var Ying positions of the piston.

A further object of the invention is to pro-l vide' an inexpensive, easily operated and easily assembled engine. of the above class.

lVith the above objects 1n View tlie invention consists essentially in the ari-angement andv construction o@ artshereinafter more mirticularly describerfand later pointed out iii the appended claims.

Figure l represents a" side viewof'the engine, the crank case being shown in vertical section. F ig. 2 represents a vertical sec-- tional `View longitudinally through the engine, certain parts being shown in side elevation and the valves appearing in the posif outer sleeve. the parts being shown in a reverse position to that appearing in Fig. 1. v.

Fi 7 is an enlaro'ed detailed horizontal secs 1 nu o n tional vie w through the cylinder, the section beine' taken. in the )lane denoted bv the line l--P ll1 ig. Q. l* ig. 8 is an enlarged detailed horizontal sectional view through the cylinder, the section lreing taken in the ilane denoted by the line Thil Fig. 2. ig.' 94 is an enlei Afigure. y

1 represents `the crank case fitted With :ed detailed horizontal-l sectional Patented May 25. 1915.

View through the cylinder, the section being taken in the plane denoted bythe line X- X Fig. 2. Fig. l() is an enlarged detailed horizontal sectional view through the cylinder, the section being taken in the plane denoted by the line Y-f-Y Fig. 2. Fig. l1 is an enlarged detailed horizontal' sectional` `riew through the crank ease, the section being taken in the plane denoted by the line Z-Z Fig. 2,and looking toward the cylinder. Fig. l2 represents diagrainiiiaticallyy an enlarged detailed side view of the eccentrics and crank. f

In the drawingslike rcharacters of reference indicate corresponding parts ineacli hangers Zand 3 whereby the case can be suitably suspended from an adjoining structure. l representstlie drive shaft of the e11- gine mounted in suitable bearings presented by the crank ease and fitted ymore or less centrally Witlia crank 5. 6 represents the engine cylinder which is suitably Water jacketed as indicated at 7 and has' the lower end flared outwardly at 8 and fastened by bolts 9 to the crank case, the bolts passing through the cylinder head 10 and effecting the fastening `of the head to the cylinder as will readily be understood. The head is supplied with a central boss ll and a short sleeve V12,

the boss and sleeve being preferably cast integral with the head and arranged so that they extend within and are concentric with" the cylinderwhen the said parts are assembled. The-upper end' of the cylinder is Water jacketed and carries a spark plug i4 and an oil nozzle 15. These parts aresiinply indicated in the drawing as theirdetails y of construction are Well known and forni vno part of the present invention;

In actual practice-a small suitably driven oil pump (not shown) is utilized to inject the proper amount of oil Athrough the nozzle into the interior of the cylinder and the pump is controlled by a governorso that'the proper amount of oil Will be injected. under the Various running conditions. I Wish it tobe here 'noticed that the lower end of the cylinder is of a somewhat larger -bo're than vthe upper end, the change in internal diameter appearing at the shoulderl. vThe reef 45 as later described.

son .for this will be later explained; The lower end 'of the cylinder is supplied with a plurality of circumferentially arranged'air inlet openings 17'and the upper endis suplplied with a plurdlity ofcircumferentially arranged exhaust ,ports 18 which communicate directly with the exhaust manifcldsl)- be connected and 20. These Inanifolds can f to suitable exhaust pipes. 1o 21 representsa longer outer valve sleeve .-slidably Areceived within the cylinder' and provided more or less centrally of itslength ,with -a comparatively thick wall in whichl "have formed a plurality of transfer slots 22,l

the said slots actually appearing in the inner wall of the sleeve. As will be noticed the upper orcontracted portion of the sleeve fits into the contracted or smaller end of the cylinder while the enlarged' end of the d'2 sleeve is received slidably within `the enlarged'or lower end ofthe cylinder. -23 is a shank extending from the lower Vend of the sleeve through the head 10: and

operating between suitable guides 24'extend- 25 ing from the under sideof the head.

25 are elongatedr air inlet openings located in the lower end of the sleeve and'l 26 are exhaust ports'located in theupper endof the l cylinder, the said inlet openings and ports 8O being arranged to sweep over and register with lthe former air inlet openings 17 and the exhaust ports 18 at proper instances asV later described.

. 27 isa short or inner sleeve received slidyabl Within the lower end of the outer sleeve Igan enveloping also the sleeve 12 of the it V`S`head,y The inner sleeve is supplied also with an extendino' shank 28 which,y projects throughv the head 10 and operates between 4.0 suitable guides29 cast orr'the under side ofv thehead. The inner sleeve is supplied with a pluralityof circumferentially arranged air inlet openings 30 which'v control the'entrance 'of fresh air to the lower endv of the cylinder 31 is a piston slidably 'mounted in the upper or contractedend of the inner sleeve.

The iange 32 of the piston 'is designed so that it is spanned by thetransfer slots when ofthe drawing that is to the outer end of the stroke. l f 33. is a piston rod slidably mounted'in the boss and having the upper end connectedto 55 the piston and the lower end'connected to' v a cross'head v34 located between suitable cross head guides'35 and 36 castron the'un;

der side of the head 10.` l V37 is a connecting rod carried by the crank V5 and having the upperjen'd connected to the "jcross hea b'y means of a' pin 38.

l 50 'withdrawn tothe position shown 'in Fig. 2`

.pin 48 with the linki49 passing to'aneccen- A tion I have consideredfit best 'to showfdia-V vgrammaticallyin Fig. 12 the actual posittions of the e'ccentrics in which said ligure I `control of the outer sleeve while the eccentric 41 effects `the constant control of the inner sliding sleeve. 'v f L l u 42 is a link connected by a pin 43 to the 4shank 28 and-.by an eccentri'cstrap 44 to the eccentric 41. The forward end of the Shank;

23 is forked andrarries a pin-45 on vwhich I have mounted a square block 4`6received slidablywithin a rectangular frame 47,the

one end of the frame being connected bya l tric strap 50 mounted on the cam 40 while the other endv isconnected by means of ai' pin 51 with a link 52 passing to an eccen'itric strap 53 mounted on the eccentric 39. '1* v "j l 54 is across shaft suitably mounted the crank case and fitted witha lever 55 and y a crank 56, the crank beingconnected byr soy Ameans of a link 57 with the frame 47. `Suit?lable means are provided whereby4 thev lever* z' can be adjusted andretained in any adjusted' position. i With the construction just describedoit" will lbe 'seen thatbythrowing the leverone can manipulate the frameso that the links f 49 and 52 can be adjusted in. respfectftothe; shank.

In the position shown in Fig.' l thel 5 7 drawing it is obvious 'that-the eccentric v4() will control the shank 23 'and' `consequently the `outer sleeve `as the connection of the cam 39 will be simply taken up in a rocking Inotion Aproduced in the frame. On the other hand it will be seen that' if the `lever be thrown to-a :positionwhichwill placeftheframe in the position shown in Fjigft'r of the drawing the shank 23 and'V consequently the outer sleeve will be controlled in its Inoverment by the eccentric 39, the action of the` cam 40at this time being taken up in a rock-y ing motion producedk in the frame through the lever the shank will be coii'tiolled by either one or other of the cams.

In order to betterunderst'and the invenhave indicated the ,centersjof theseveralr eclcentric's by the referencegnume'rals ai?, b o y o and c and the centery point :of {th-e' crank "115 -by the reference numeral dit The axisy f of lthe drivevshaft is-indicated by thefreference letter e". Upon examination of. ther; y figurait will be .found that 'the throyvpf the eccentric'40is greater than4 thetlirowL of the.:-

eccentric 41 'and that thegthrow oth eccenv tric39 is less than keither 'oftheI Further-it will be seen thathboti i los the link 49' 111th@ intermediate ppsitions of' y thetransfer slots and being spanned by them 50 piston and concurrently opening the exhaust 55 been explained the action ofthe rectangular A'. Cil

raadsels the previously introduced charge Aexploded the operation is as now described: As the piston 'passes down on the Working ory out stroke, the air .previously admitted tothe .interior of the cylinderbeneath the piston is compressed, the'air inlet ports being maintainedclosed. Prior to the piston reaching theexhaust vports 26 open to the exhaust ports 18 so *that the instant the slots ,are openedv the vspent gases are effectively scavenged by the compressed air escaping around the piston through the slots and into Athe'. upper end of the cylinder.

' I Wish hereto emphasize the fact that the exhaust portsopen prior to` the scavenging. Actually the air is admitted into the lipper end of the cylinder approximately ten de-V grees after the exhaust ports have. opened.

The scavenging of the cylinder continues for the remainder of the outstrolze of the piston and for a short interval during the instroke,

- that is until such `time that the transfer slots are closed by the piston on the instreke. Shortly after 4the transfer slots have been closedby the' piston on the instroke air is admitted to uthe lower end ofthe cylinder' through the inlet passages 30 of the short sleeve. The'exhaust ports next close and the air remaining in the .upper end of the cylinder is compressed during the remainder of theinstroke of the piston and `the charge of oil lis also vinjected into vthe cylinder against the air pressure. The air inlet ports do lnot againclose until the piston has again started on the youtstroke after a further charge has been exploded in the upper end of the cylinder. This completes the cycle of operation which is continued as longa-s the engine is running, By admitting the co1npressed fresh air into the upper end ot' the cylinder at a plurality et points around the ports which are disposed around the cylinder avery effective and complete scavenging is proyided. v A* Now that theoperation of the' engine has frame y 4:7 .will 'be better understood `With the link ccontrcilling the outer sleeve and in the position shown infFig. l of the drawings I have shown vthe exhaust valves closed instroke'to icomplete While if the link 52 is 'controllingv tl shown in aigre of the drawing the exhaust Leslecve and is in the position valve closes at a later'time in the stroke. ln the latter ease which I terni the throttle position I have a much better scavenging than in the first case. This is an important feature as most engines run throttled.

I Wish here to explain that the quantity of oil injected into the engine by the pump will require to behcontrolled by the governor previously mentioned in such a 'Way that the richness of the iring mixture will not vary whether the engine be running at open or ,throttled position. l wish to point out that the engine could be modified to avoid the use of a cross head.

What I claim as .my invention is l. The combination ivitha suitably mounted crank case, a crank shaft mounted in the crank case, a cylinder secured to the crank case and provided at the one end with suitable air inlet openings and at the other end With suitable exhaust ports, of a valve sleeve slidably mounted in the cylinder," and provided at oneend with air inlet openings designed to register with the aforesaid air inlet openings and at the other end with eX- haust .ports designed to register with the eX- haust ports and .having transfer slots ap` peering on the inner Wall thereof, means for reciprocating the sleeve to eifiieet the opening and closing of tre air inlet openings and the exhaust ports, and a piston slidably mounted Within the sleeve and connected to the crank shaft, said piston being arranged 'to be spanned by the t 'ansfer slots in the outstroke thereof, as and for the purpose specified.

2. The combination vfitlia suitably mounted crank case, a crank shaft mountedoin the crank case7 a cylinder secured to the. crank case and provided at the one end 'with suitable air inlet openings and at the other end With suitable exhaust ports7 of a valve sleeve slidably mounted in the cylinder and provided at the one end with air inlet openings designed `to register with the aforesaid air inlet openings and at the other end with enhaust ports designed to register with the eX- haust ports and having transfer slots appearing on the inner Wall thereof, means Jfor reciprocating the sleeve to eiect the opening and closing oi the air inlet openings and, the exhaust ports, a piston slidaoly 'mounted Within 'the sleeve and connected to the crank .shaftv said piston being arranged to be. spanned by the transfer slots 1n the outstroke. thereof, and means for varying lthe stroke ofthe sleeve, as and f pr the purpose specified.j

*valve sleeve slidably mounted in the cylinder-and provided at the one end with air inlet openings designed to register with the aforesaid air inlet openings and at the other 5 endwith exhaust ports designed to register with .the -exhaust ports and having transfer' lslots lappearing on the inner `wall thereof, means for reciprocating the sleeve to effect the opening' and closing of the air inlet 1c openings and the exhaust-ports, an inner .valvefsleeve slidably mountedy within the ,guter sleeve and provided with airV inlet .ivalve ports designed to register with the air ports, means for reciprocating the in-l flnervalve sleeve to control the admission of ""1 fair through the inlet openings to the lower endof the cylinder, a piston slidably vmountfedl in the'outer sleeve and meansy connecting the cylinder with the crank Sheff/,Saidpiston'rbeing arranged to beA spanned by the transfer slots in the Working stroke thereof,

as and for the purpose speciied. ,vl

IThe combination with a cr lnk case and a crank shaft mounted in the crank case, of a cylinder mounted on the crank case and 'fitted at the one end with suitabl/eair inlet openings and at tf e `other end with suitable exhaust portsan provided at/the former end with a head carrying an extending short sleeve contained within the cylinder, an

outer sleev'slidably mounted in the cylin-l der and provided at oneend with air inlet openings and at theI oppositeend with ex-` haust ports'and having the inner wall thereaqofrditted with transfer slots, means for reciprocatingthe sleeve to effect the registrawithin the outer ysleeve and connected with y the crank shaft through the head, said piston being designed" to be spanned by the 5o transfer slots in the working stroke thereof.

as and for the purpose specified. y l

5. The combination with a crankcase andVV a crank shaft mounted in the crank case, of

f a cylinder mounted on the crank case and tted at the one end'with suitable air inlet openings and at the other end with suitable exhaust ports and provided aty the former end with a head carryingan extending short l "sleeve contained within the cylinder, an

` outer sleeve slidably mounted in the cylinder and provided vat one end with air inlet openings and at the opposite end with exhaust ports and having the inner wall thereof `fits ted with transfer slots, an eccentric mount` with corresponding inlet openings-an terrii ed on the crank yshaft and connected through 6l a suitable link with the outersleeve, said eccentric controlling throu h `the sleeve the n registration of the respectivefinletl openings and the respective exhaust ports, aneinner sleeve slidably mounted within the outer 7( sleeve and contained between 'the outer sleeve and the short sleeve of the cylinder head, said inner sleeve being fitted with air-inlet openings, an eccentric mountedon the 'crank g shaft and connected withthe inner sleeve, said latter eccentric controlling the admsl sion of air through the'inlet openings to the lower end o'f the cylinder and a pistonslidably mounted within the outer' sleeve and connected with the crank `shaft.through the'. 81 head, said piston being designed to be spanned by the transfer slotsiin the working eitrike thereof, as and for the purpose specie Y e, 6.' The combination with a crank case and 81 a crank shaft mounted in the crankcase, of a cylinder mounted on the crank case and vfitted at the one4 endwith suitable air inlet openings and lat thefother end witlisuitable -exhaust'ports and provided at ther former 91 end with a head carrying an extending short sleevey contained ywithin the cylinder, an

.outer sleeve slidably mounted inthe cylinderv and provided at one end `with'air inlet openings and at the opposite'endwithexhaust, 91 ports and having the Vinnerv wall thereof litlted with transfer slots, a `air Aof eccentrics mounted on the crank sha links connected to the eccentrics, a rectangular frame carried by the links, means connecting the outer 1 sleeve slidably with the rectangular-frame, said :eccentrics controllingthrough the sleeve the registration. of the respective inlet.- openings and Athe respective exhaust ports, an inner sleeve slidably mounted with- 1 in the outer sleeve and contained between the outer sleeve andthe short sleeve of the cylinder head, said innerfsleeve being fitted with air inlet openings, an eccentric mounted o n the crank shaft andconnected lwith 1 kthe inner sleeve, said latter eccentric controlling the admission of "air through the inletopenings'to the lower end of the cylin der anda piston slidably mounted 'withiny the inner sleeve and connected with p the 1 crankv shaft through, the head, saidpiston being designed to bev spanned by the transfer slots in the working stroke thereof, as l andfor the, purpose specified. y 7.-The combination with a cylinderipro l1 vided `withl suitable closure Aheads and having air inlet'openings located in one end Y thereof and exhaust ports located in the, other end thereof, off a reciprocatingsleeve contained within thevcylinder and su? lied -1 haust ports and having transfer slotsfcrnl dj' inthe inner wall thereof intermediate'gdfsit's' Y length and 'ai reciproczzting piston slidably Signed Aai', Winnipeg thay of .mounted Within the sleeve and arranged' te Apri 1914.

be spanned by the transferlots in the work- P :"5 ing stroke thereof 'and eEect a communica- 51' tion between the ends' of the cylinder past ,In the presence ofthe piston through the slots, as and for the G. S. Roxvmm,

purposespecied.' S. Smv'm'r'.

i PRNG-BE. 

